1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2021 ARM Ltd.
4 */
5
6 #ifndef _LINUX_ARM_FFA_H
7 #define _LINUX_ARM_FFA_H
8
9 #include <linux/device.h>
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/uuid.h>
13
14 /* FFA Bus/Device/Driver related */
15 struct ffa_device {
16 int vm_id;
17 bool mode_32bit;
18 uuid_t uuid;
19 struct device dev;
20 };
21
22 #define to_ffa_dev(d) container_of(d, struct ffa_device, dev)
23
24 struct ffa_device_id {
25 uuid_t uuid;
26 };
27
28 struct ffa_driver {
29 const char *name;
30 int (*probe)(struct ffa_device *sdev);
31 void (*remove)(struct ffa_device *sdev);
32 const struct ffa_device_id *id_table;
33
34 struct device_driver driver;
35 };
36
37 #define to_ffa_driver(d) container_of(d, struct ffa_driver, driver)
38
ffa_dev_set_drvdata(struct ffa_device * fdev,void * data)39 static inline void ffa_dev_set_drvdata(struct ffa_device *fdev, void *data)
40 {
41 fdev->dev.driver_data = data;
42 }
43
44 #if IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT)
45 struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id);
46 void ffa_device_unregister(struct ffa_device *ffa_dev);
47 int ffa_driver_register(struct ffa_driver *driver, struct module *owner,
48 const char *mod_name);
49 void ffa_driver_unregister(struct ffa_driver *driver);
50 bool ffa_device_is_valid(struct ffa_device *ffa_dev);
51 const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev);
52
53 #else
54 static inline
ffa_device_register(const uuid_t * uuid,int vm_id)55 struct ffa_device *ffa_device_register(const uuid_t *uuid, int vm_id)
56 {
57 return NULL;
58 }
59
ffa_device_unregister(struct ffa_device * dev)60 static inline void ffa_device_unregister(struct ffa_device *dev) {}
61
62 static inline int
ffa_driver_register(struct ffa_driver * driver,struct module * owner,const char * mod_name)63 ffa_driver_register(struct ffa_driver *driver, struct module *owner,
64 const char *mod_name)
65 {
66 return -EINVAL;
67 }
68
ffa_driver_unregister(struct ffa_driver * driver)69 static inline void ffa_driver_unregister(struct ffa_driver *driver) {}
70
71 static inline
ffa_device_is_valid(struct ffa_device * ffa_dev)72 bool ffa_device_is_valid(struct ffa_device *ffa_dev) { return false; }
73
74 static inline
ffa_dev_ops_get(struct ffa_device * dev)75 const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev)
76 {
77 return NULL;
78 }
79 #endif /* CONFIG_ARM_FFA_TRANSPORT */
80
81 #define ffa_register(driver) \
82 ffa_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
83 #define ffa_unregister(driver) \
84 ffa_driver_unregister(driver)
85
86 /**
87 * module_ffa_driver() - Helper macro for registering a psa_ffa driver
88 * @__ffa_driver: ffa_driver structure
89 *
90 * Helper macro for psa_ffa drivers to set up proper module init / exit
91 * functions. Replaces module_init() and module_exit() and keeps people from
92 * printing pointless things to the kernel log when their driver is loaded.
93 */
94 #define module_ffa_driver(__ffa_driver) \
95 module_driver(__ffa_driver, ffa_register, ffa_unregister)
96
97 /* FFA transport related */
98 struct ffa_partition_info {
99 u16 id;
100 u16 exec_ctxt;
101 /* partition supports receipt of direct requests */
102 #define FFA_PARTITION_DIRECT_RECV BIT(0)
103 /* partition can send direct requests. */
104 #define FFA_PARTITION_DIRECT_SEND BIT(1)
105 /* partition can send and receive indirect messages. */
106 #define FFA_PARTITION_INDIRECT_MSG BIT(2)
107 u32 properties;
108 };
109
110 /* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */
111 struct ffa_send_direct_data {
112 unsigned long data0; /* w3/x3 */
113 unsigned long data1; /* w4/x4 */
114 unsigned long data2; /* w5/x5 */
115 unsigned long data3; /* w6/x6 */
116 unsigned long data4; /* w7/x7 */
117 };
118
119 struct ffa_mem_region_addr_range {
120 /* The base IPA of the constituent memory region, aligned to 4 kiB */
121 u64 address;
122 /* The number of 4 kiB pages in the constituent memory region. */
123 u32 pg_cnt;
124 u32 reserved;
125 };
126
127 struct ffa_composite_mem_region {
128 /*
129 * The total number of 4 kiB pages included in this memory region. This
130 * must be equal to the sum of page counts specified in each
131 * `struct ffa_mem_region_addr_range`.
132 */
133 u32 total_pg_cnt;
134 /* The number of constituents included in this memory region range */
135 u32 addr_range_cnt;
136 u64 reserved;
137 /** An array of `addr_range_cnt` memory region constituents. */
138 struct ffa_mem_region_addr_range constituents[];
139 };
140
141 struct ffa_mem_region_attributes {
142 /* The ID of the VM to which the memory is being given or shared. */
143 u16 receiver;
144 /*
145 * The permissions with which the memory region should be mapped in the
146 * receiver's page table.
147 */
148 #define FFA_MEM_EXEC BIT(3)
149 #define FFA_MEM_NO_EXEC BIT(2)
150 #define FFA_MEM_RW BIT(1)
151 #define FFA_MEM_RO BIT(0)
152 u8 attrs;
153 /*
154 * Flags used during FFA_MEM_RETRIEVE_REQ and FFA_MEM_RETRIEVE_RESP
155 * for memory regions with multiple borrowers.
156 */
157 #define FFA_MEM_RETRIEVE_SELF_BORROWER BIT(0)
158 u8 flag;
159 u32 composite_off;
160 /*
161 * Offset in bytes from the start of the outer `ffa_memory_region` to
162 * an `struct ffa_mem_region_addr_range`.
163 */
164 u64 reserved;
165 };
166
167 struct ffa_mem_region {
168 /* The ID of the VM/owner which originally sent the memory region */
169 u16 sender_id;
170 #define FFA_MEM_NORMAL BIT(5)
171 #define FFA_MEM_DEVICE BIT(4)
172
173 #define FFA_MEM_WRITE_BACK (3 << 2)
174 #define FFA_MEM_NON_CACHEABLE (1 << 2)
175
176 #define FFA_DEV_nGnRnE (0 << 2)
177 #define FFA_DEV_nGnRE (1 << 2)
178 #define FFA_DEV_nGRE (2 << 2)
179 #define FFA_DEV_GRE (3 << 2)
180
181 #define FFA_MEM_NON_SHAREABLE (0)
182 #define FFA_MEM_OUTER_SHAREABLE (2)
183 #define FFA_MEM_INNER_SHAREABLE (3)
184 u8 attributes;
185 u8 reserved_0;
186 /*
187 * Clear memory region contents after unmapping it from the sender and
188 * before mapping it for any receiver.
189 */
190 #define FFA_MEM_CLEAR BIT(0)
191 /*
192 * Whether the hypervisor may time slice the memory sharing or retrieval
193 * operation.
194 */
195 #define FFA_TIME_SLICE_ENABLE BIT(1)
196
197 #define FFA_MEM_RETRIEVE_TYPE_IN_RESP (0 << 3)
198 #define FFA_MEM_RETRIEVE_TYPE_SHARE (1 << 3)
199 #define FFA_MEM_RETRIEVE_TYPE_LEND (2 << 3)
200 #define FFA_MEM_RETRIEVE_TYPE_DONATE (3 << 3)
201
202 #define FFA_MEM_RETRIEVE_ADDR_ALIGN_HINT BIT(9)
203 #define FFA_MEM_RETRIEVE_ADDR_ALIGN(x) ((x) << 5)
204 /* Flags to control behaviour of the transaction. */
205 u32 flags;
206 #define HANDLE_LOW_MASK GENMASK_ULL(31, 0)
207 #define HANDLE_HIGH_MASK GENMASK_ULL(63, 32)
208 #define HANDLE_LOW(x) ((u32)(FIELD_GET(HANDLE_LOW_MASK, (x))))
209 #define HANDLE_HIGH(x) ((u32)(FIELD_GET(HANDLE_HIGH_MASK, (x))))
210
211 #define PACK_HANDLE(l, h) \
212 (FIELD_PREP(HANDLE_LOW_MASK, (l)) | FIELD_PREP(HANDLE_HIGH_MASK, (h)))
213 /*
214 * A globally-unique ID assigned by the hypervisor for a region
215 * of memory being sent between VMs.
216 */
217 u64 handle;
218 /*
219 * An implementation defined value associated with the receiver and the
220 * memory region.
221 */
222 u64 tag;
223 u32 reserved_1;
224 /*
225 * The number of `ffa_mem_region_attributes` entries included in this
226 * transaction.
227 */
228 u32 ep_count;
229 /*
230 * An array of endpoint memory access descriptors.
231 * Each one specifies a memory region offset, an endpoint and the
232 * attributes with which this memory region should be mapped in that
233 * endpoint's page table.
234 */
235 struct ffa_mem_region_attributes ep_mem_access[];
236 };
237
238 #define COMPOSITE_OFFSET(x) \
239 (offsetof(struct ffa_mem_region, ep_mem_access[x]))
240 #define CONSTITUENTS_OFFSET(x) \
241 (offsetof(struct ffa_composite_mem_region, constituents[x]))
242 #define COMPOSITE_CONSTITUENTS_OFFSET(x, y) \
243 (COMPOSITE_OFFSET(x) + CONSTITUENTS_OFFSET(y))
244
245 struct ffa_mem_ops_args {
246 bool use_txbuf;
247 u32 nattrs;
248 u32 flags;
249 u64 tag;
250 u64 g_handle;
251 struct scatterlist *sg;
252 struct ffa_mem_region_attributes *attrs;
253 };
254
255 struct ffa_dev_ops {
256 u32 (*api_version_get)(void);
257 int (*partition_info_get)(const char *uuid_str,
258 struct ffa_partition_info *buffer);
259 void (*mode_32bit_set)(struct ffa_device *dev);
260 int (*sync_send_receive)(struct ffa_device *dev,
261 struct ffa_send_direct_data *data);
262 int (*memory_reclaim)(u64 g_handle, u32 flags);
263 int (*memory_share)(struct ffa_device *dev,
264 struct ffa_mem_ops_args *args);
265 };
266
267 #endif /* _LINUX_ARM_FFA_H */
268